Police in Mexico are investigating whether the bodies of 72 people found murdered were those of illegal migrants.
The war between various drug gangs and security forces has been notoriously bloody, but this massacre seems particularly gruesome.
The bodies were found piled on a property about 150-kilometres from the Texan border.
A lone survivor says the dead were migrants heading for the US, apparently killed for refusing to pay off a drug gang.
Al Jazeera's Mariana Sanchez reports from Mexico City.
